[PATCH] nand_wait : warn if the nand is busy on exit

[PATCH] nand_wait : warn if the nand is busy on exit

[Matthieu CASTET]

This patch allow to detect buggy driver/hardware with
bad RnB (dev_ready) management or when timeout occurs in polling mode.

This works when dev_ready is set or not set.
There are 2 methods to wait for an erase/program command completion:

1. Wait until nand RnB pin goes high (that's what chip->dev_ready usually does)
2. Poll the device: send a status (0x70) command and read status byte in a loop
   until bit NAND_STATUS_READY is set

In all cases, you should send a status command after completion, to check if
the operation was successful. And if the operation completed, the status should
have bit NAND_STATUS_READY set.

Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>
CC: Ivan Djelic <ivan.djelic@parrot.com>
---
 drivers/mtd/nand/nand_base.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index ee49fe2..5894c2c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -865,6 +865,8 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 	led_trigger_event(nand_led_trigger, LED_OFF);
 
 	status = (int)chip->read_byte(mtd);
+	/* This can happen if in case of timeout or buggy dev_ready */
+	WARN_ON(!(status & NAND_STATUS_READY));
 	return status;
 }
 
-- 
1.7.10.4

Re: [PATCH] nand_wait : warn if the nand is busy on exit

[Artem Bityutskiy]

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On Mon, 2012-11-05 at 15:00 +0100, Matthieu CASTET wrote:
> This patch allow to detect buggy driver/hardware with
> bad RnB (dev_ready) management or when timeout occurs in polling mode.
> 
> This works when dev_ready is set or not set.
> There are 2 methods to wait for an erase/program command completion:
> 
> 1. Wait until nand RnB pin goes high (that's what chip->dev_ready usually does)
> 2. Poll the device: send a status (0x70) command and read status byte in a loop
>    until bit NAND_STATUS_READY is set
> 
> In all cases, you should send a status command after completion, to check if
> the operation was successful. And if the operation completed, the status should
> have bit NAND_STATUS_READY set.
> 
> Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>
> CC: Ivan Djelic <ivan.djelic@parrot.com>

Pushed to l2-mtd.git, thanks!

-- 
Best Regards,
Artem Bityutskiy

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